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The Instrument Test Port has a durable cast zinc alloy construction with a heavy gauge zinc plated cap. Its Neoprene Expansion Plug can withstand up to 180°F and has resisted pressures up to 90 psi when installed. The TH-1 accommodates 1�? of insulating materials and has an inside diameter of 1-1/16�?. The IP-2 accommodates 2�? of insulation material and has an inside diameter of 1-1/8�?. The IP-4 offers a 3/4’’ diameter access to the air stream. All are designed for high velocity systems. A flat neoprene mounting gasket is supplied. However, for maximum protection against leakage, we recommend using Quad Seal.